Update version to 1.16.1.post1

[nadiaya]

Update version to 1.16.1.post1

Merge Checklist

Put an x in the boxes that apply. You can also fill these out after creating the PR. If you're unsure about any of them, don't hesitate to ask. We're here to help! This is simply a reminder of what we are going to look for before merging your pull request.

• I have read the CONTRIBUTING doc
• I have added tests that prove my fix is effective or that my feature works (if appropriate)
• I have updated the changelog with a description of my changes (if appropriate)
• I have updated any necessary documentation (if appropriate)

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[jesterhazy]

doc-fixes not enhancements

It doesn't fix anything, so it's not doc-fix.

[codecov-io]

Codecov Report

Merging #516 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff           @@
##           master    #516   +/-   ##
======================================
  Coverage    92.7%   92.7%           
======================================
  Files          71      71           
  Lines        5336    5336           
======================================
  Hits         4947    4947           
  Misses        389     389

Impacted Files	Coverage Δ
src/sagemaker/__init__.py	100% <100%> (ø)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 650cfa8...9cd7918. Read the comment docs.

[laurenyu]

in the past, when the documentation update is for adding explanations for a new feature, we've labeled it as a "feature" (e.g. 1.0.1, 1.0.2, 1.0.3, 1.0.4, 1.7.0, 1.13.0) or a "doc-fix" (e.g. 1.10.1, 1.11.1, 1.14.2). This isn't really an "enhancement"; if the documentation were just further clarifying something that was already written, it'd seem more like an "enhancement".